Rain gauge



FIG. 1 is a top, front, and left side perspective view of a rain gauge showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a rain gauge or similar article, as shown. 